[Gta04-owner] successful boot from usb

[H. Nikolaus Schaller]

> Am 20.11.2017 um 07:40 schrieb Andreas Kemnade <andreas at kemnade.info>:
> 
> On Sun, 19 Nov 2017 13:28:34 +0100
> Andreas Kemnade <andreas at kemnade.info> wrote:
> 
>> On Sat, 18 Nov 2017 23:29:32 +0100
>> Andreas Kemnade <andreas at kemnade.info> wrote:
>> 
>>> Hi,
>>> 
>>> I have hacked the pusb tool a bit so that I could use it to boot the
>>> gta04. The original pusb tool seems to work only at the right moon
>>> phase, the gta04 oriented exactly in north-south direction ;-)
>>> 
>>> Now I am a quit independant of that.
>> 
>> The results are here:
>> https://github.com/akemnade/omap-u-boot-utils/
>> 
>> Now I just have to find out why I can only boot the old SLO that way
>> (on A4).
> 
> 
> Well, I found the reason.
> 1. There is MLO and spl/u-boot-spl.bin
> The further has a CHSETTINGS header which can configure things like
> image start address. This header cannot be used for peripheral boots like
> serial or usb, only for flash/mmc boots. So the image start address has to stick
> to the standard.

Ok, this means that MLO is a special variant only.

But did I understand it correctly, we have to strip the headers from spl/u-boot-spl.bin
to make it an image for serial/usb boot?

If we understand that and have a script that does it, we can automatically add
such images to:

http://download.goldelico.com/letux-u-boot/GTA04-OneNAND/latest/

> 
> After I changed that base address, I could load a recent spl from usb.
> I managed to load uboot via ymodem (not that strange kermit anymore) via rs232.
> Next step would be to enable dfu in spl. There is an option in uboot for that.
> But I do not manage to compile u-boot that way.
> 
> But what can be more easily managed: Compile dfu into main uboot (well,
> you have to first enable the dfu command, then you can open the dfu menu in uboot menuconfig),
> so it can be enabled on a button in the menu.
> Access to mmc and to ram seems to work, access to onenand cannot be enabled.
> But with dfu to ram, you can e.g. load kernel, fdt and a ramdisk and a script to ram.
> Or load other things to ram and flash it to nand using that script.
> So with that you can basically do a lot of things.

Wow, cool work!

If you have patches for our u-boot git (that do not break OMAP4 & OMAP5), we can integrate them.

BR,
Nikolaus

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